At last Bob became _____ the danger of smoking and ?decided? to give it up. [ ]

A.aware                  

B.aware of

C.aware with

D.aware that

正常胎位分娩机制的概念正确的是（）

A.衔接：胎头颅骨最低点接近或达到坐骨棘水平

B.下降：呈持续性，贯穿分娩全过程

C.俯屈：经俯屈胎头前囟位置最低

D.内旋转：胎头到达骨盆出口适应骨盆纵轴而旋转

E.仰伸：胎头颏部紧贴胸部